assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0060564  oio:id           DOID:0060564  xsd:string  
1          0           graph  DOID:7147     rdfs:subClassOf  DOID:0060564  _IRI        
1          0           graph  DOID:4153     rdfs:subClassOf  DOID:0060564  _IRI